This has some potential...
... but it really needs quite a bit of reworking. Everything, especially the text buttons at the start, are very hard to click on. The items, and sometimes the zerglings, in the gameplay are also more difficult to click than they should be. Good job on using all the sound from SC perfectly, but the spriting here good be a little bit smoother (when the zerglings die, the blood splatter is a little bit to the down and right of where it was). The clicking is the biggest setback, though, and since the mechanics are off, it makes the game exceedingly difficult.
Keep working on it, and I think it'll come out great!